He reported on the global environment in print and on Dot Earth. He has spent a quarter century covering subjects ranging from Hurricane Katrina and the Asian tsunami to the assault on the Amazon and the troubled relationship of climate science and politics. He has been reporting on the environment for The New York Times since 1995, a job that has taken him to the Arctic three times. In 2003, he became the first Times reporter to file stories and photos from the sea ice around the Pole. He spearheaded a three-part Times series and one-hour documentary in 2005 on the transforming Arctic and another series, "The Climate Divide," on the uneven impacts of climate change.

He has written books on the Amazon rain forest, global warming and the once and future Arctic. Before joining The Times, Mr. Revkin was a senior editor of Discover, a staff writer for the Los Angeles Times, and a senior writer at Science Digest. Mr. Revkin has a biology degree from Brown and a Master's degree in journalism from Columbia. He has taught at Columbia's Graduate School of Journalism and the Bard College Center for Environmental Policy.

He lives in the Hudson River Valley with his wife and two sons. In spare moments, he is a performing songwriter and multi-instrumentalist who occasionally accompanies Pete Seeger at regional shows and plays in a folk-roots band, Uncle Wade.

The Intergovernmental Panel on Climate Change released its latest report on Feb. 2, which provided a grim and powerful assessment of the future of the planet. The Times' Andrew C. Revkin answered readers' questions and responded to comments.

In a series of articles, a team of Times reporters described how the world is, and is not, moving toward a more secure, and less environmentally damaging, relationship with energy. Several of the writers responded to questions and comments